docs: def diff_with_models(self):
          """
          Return a dict stating the differences between current state of models
          and the configuration itself.
          TODO: Detect fields that are in conf, but not in models
          """
          missing_from_conf = defaultdict(set)
  
          for model in get_models():
              db_tables_and_columns = get_db_tables_and_columns_of_model(model)
              for (table_name, columns) in db_tables_and_columns.items():
                  model_strategy = self.strategy.get(table_name)
                  for column in columns:
                      if not model_strategy or column not in model_strategy:
                          missing_from_conf[table_name].add(column)
          return missing_from_conf